Haven't heard of mustard oil in the successful treatment of breast infection or mastitis but I know that using castor oil is a popular, tried and tested method. Olive oil, sweet almond oil and aloe vera are also said to work well. Mustard oil is known for its anti-bacterial properties so maybe it might just work for breast infection -- can't find much information about it though.
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Breast infection is usually infection within the breast tissue. Some IBCLCs have argued that antibiotics are not necessary, the key is to keep the breast as empty as possible.